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Related Experiment Videos

Reconciling the numbers: ESTs versus protein-coding genes.

Anton Nekrutenko1

  • 1Department of Biochemistry and Molecular Biology, The Huck Institutes for Life Sciences, Pennsylvania State University, University Park, PA, USA. nekrut@psu.edu

Molecular Biology and Evolution
|March 23, 2004
PubMed
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Mammalian genomes contain millions of expressed sequences, but only a small fraction can code for proteins. Evolutionary analysis reveals that these sequences likely represent around 20,000 distinct protein-coding transcripts.

Area of Science:

  • Genomics
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Mammalian genomes exhibit a vast number of expressed sequences, far exceeding the predicted count of protein-coding genes.
  • Understanding the functional capacity of these expressed sequences is crucial for comprehending genome complexity.

Purpose of the Study:

  • To determine the proportion of expressed sequences in mammalian genomes that are capable of protein-coding.
  • To estimate the number of distinct protein-coding transcripts represented by the multitude of expressed sequences.

Main Methods:

  • Utilized an evolutionary approach to analyze expressed sequences from human and mouse genomes.
  • Applied sequence clustering based on cross-species relationships to identify distinct coding transcripts.

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Main Results:

  • Identified that only 9% to 14% of human- and mouse-expressed sequences possess protein-coding potential.
  • Clustering analysis suggests that millions of expressed sequences may converge to approximately 20,000 unique protein-coding transcripts.

Conclusions:

  • A significant portion of expressed sequences in mammalian genomes are non-coding.
  • The complexity of the mammalian transcriptome may be substantially lower than previously suggested by the sheer number of expressed sequences.